Harry's bracelet is two griffins, and Draco's is two serpents with feathered collars (sort of like Quetzalcoatl). As for Severus's, that's so hard to detect because I haven't written a description of it yet.
There's a drabble set in the same 'verse that describes the bracelets. And I'm working on a longer, probably novel-length story that brings it all together.